Kickdown switch for the 69 is mounted on the carb, attaches to the mounting stud closest to the drive. It's a real pain. The 71 & on used a switch connected to the accelerator pedal, supposed to be a lot easier to work with, but requires the pedal mount and cable to convert. Good luck on finding parts for either one. You might try the
67-72 web page if you need some of the parts.
Does the 400 have a shift kit in it? It will help make the clutches last longer.
